| 摘要 |
PURPOSE:To make reduction in cell capacity preventable from occurring even in time of a repetition of charging and discharging, by joining hydrogen-occluded alloy particles rigidly to a conductive base body via a metallic matrix. CONSTITUTION:LaNi5 on the market is reduced into powder with a ball mill, and the powder of below 10mu in size classified by a sieve is thrown into a nickel chloride bath at a rate of about 5g/l, then an Ni-make net is set down to the cathode while stirring it sufficiently, while an Ni plate is set down to the anode and composite plating takes place. As a result, an eutectoid quantity of the LaNi5 is securable as a sample of 10g/dm<2>. This sample makes a nickel peroxide electrode a counter electrode inside 35% KOH and charging-discharging characteristics are examined. Charging and discharging are carried out with a constant current, and current density in time of charging is set to a degree of 40mA/cm<2>, while another current density in time of discharging is set to 20mA/ cm<2>, and discharge finish potential is set a reference voltage of -0.5Vvs.Hg/ HgO. When a variation in discharge capacity by a repetition of this charging and discharging is examined, a drop in the discharge capacity is about 10% or so even if charging and discharging for 500 times are performed. |
